通过[Ru {(S)-phgly} 2 {(S)-binap}]和C 6 H 5 OLi的联合体系催化,HCN向α,β-不饱和酮的对映选择性共轭加成反应提供了高浓度的β-氰基酮产量(请参阅计划)。没有产生可检测量的相应的1,2-加合物,叔C 4 H 9 OCH 3是选择的溶剂。在-20-0°C下,氰化反应以底物与催化剂的摩尔比在200:1-1000:1的范围内进行。
通过[Ru {(S)-phgly} 2 {(S)-binap}]和C 6 H 5 OLi的联合体系催化,HCN向α,β-不饱和酮的对映选择性共轭加成反应提供了高浓度的β-氰基酮产量(请参阅计划)。没有产生可检测量的相应的1,2-加合物,叔C 4 H 9 OCH 3是选择的溶剂。在-20-0°C下,氰化反应以底物与催化剂的摩尔比在200:1-1000:1的范围内进行。
Nickel/Photoredox Dual-Catalyzed Conversion of Allyl Esters to Ketones via the Formal Deletion of Oxygen
作者:Ryoma Shimazumi、Riku Tanimoto、Mamoru Tobisu
DOI:10.1021/acs.orglett.3c02606
日期:2023.9.1
We report herein the catalytic conversion of allylic esters into the corresponding ketones by the formal deletion of an oxygen atom. The key to the success of the reaction is the dual use of nickel and photoredox catalysts; the former mediates C–O bond activation and C–C bond formation, while the latter is responsible for deoxygenation of the acyloxy group using PPh3 as a stoichiometric reductant.
Asymmetric Hydrocyanation of α,β-Unsaturated Ketones into β-Cyano Ketones with the [Ru(phgly)<sub>2</sub>(binap)]/C<sub>6</sub>H<sub>5</sub>OLi Catalyst System
Enantioselective conjugate addition of HCN to α,β‐unsaturated ketones catalyzed by the combined system of [Ru(S)‐phgly}2(S)‐binap}] and C6H5OLi has afforded β‐cyano ketones in high yield (see scheme). No detectable amount of the corresponding 1,2‐adduct was produced and tert‐C4H9OCH3 was the solvent of choice. The cyanation was conducted with a substrate‐to‐catalyst molar ratio in the range of 200:1–1000:1
通过[Ru (S)-phgly} 2 (S)-binap}]和C 6 H 5 OLi的联合体系催化,HCN向α,β-不饱和酮的对映选择性共轭加成反应提供了高浓度的β-氰基酮产量(请参阅计划)。没有产生可检测量的相应的1,2-加合物,叔C 4 H 9 OCH 3是选择的溶剂。在-20-0°C下,氰化反应以底物与催化剂的摩尔比在200:1-1000:1的范围内进行。